I've tried a metric ruler and it's definitely bigger than 15mm... maybe 16mm but even then seems a wee bit bigger?I have a reason to believe, the tread sizes are the same as the ones used for the ordinary 1/2 inch or 15mm pipework.

I've tried a metric ruler and it's definitely bigger than 15mm... maybe 16mm but even then seems a wee bit bigger?I have a reason to believe, the tread sizes are the same as the ones used for the ordinary 1/2 inch or 15mm pipework.
Sorry I wasn't obvious, i meant the fittings used for the 15mm od pipework. Maybe you already have some of them in your toolbox.I've tried a metric ruler and it's definitely bigger than 15mm... maybe 16mm but even then seems a wee bit bigger?
View attachment 64512
I've checked it, those are much bigger.Sorry I wasn't obvious, i meant the fittings used for the 15mm od pipework. Maybe you already have some of them in your toolbox.
Hibigger?
Thank you that helps lotsHi
It’s 3/8”... you’ll get a 3/8”x10/12mm fitting at most plumbing places. I’d use BES if you can’t get to plumbcentre.
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